Hydraulic hoist



April 5, 1960 c. M. SALES HYDRAULIC HOIST Filed Aug. 1, 1958 Gharles 9%.5a1a5. b9 dplorr g United St tes Pa fi O ice HYDRAULIC HOIST Charles M. Sales, Seymour, Iowa Application August 1, 1958, Serial No. 752,464

4 Claims. (Cl. 254-139) This invention relates to elevating and lowering means and more particularly to a hoist for raising and lower"- ing farm wagon boxes and the like. a i

The idea of elevating the front end of wagon boxes and the like to dump material from the box is old, and a number of hoist means are now on the market, illustrative of which is my issued United States Letters Patent, No. 2,648,521, on a Hoist. Such devices are most effective in use, but they all have the disadvantages of difiicult hydraulic jack installation, and excessive frame structures at the top of the hydraulic jack cylinder.

Therefore one of the principal objects of my invention is to provide a simple, easily actuated means for detachably securing the hydraulic jack to the hoist frame structure.

A further object of this invention is to provide a hoist frame structure that does not extend to the upper end of the hydraulic jack cylinder being supported.

More specifically, the object of my invention is to provide a clamp means that will be automatically actuated for holding the hydraulic jack to the frame structure during the operation of the jack.

A still further object of my invention is to provide a hoist that is well adapted for use in an area that is limited in width.

It is a still further object of my invention to provide a hoist using a jack as the lifting element; said jack being readily demountable to serve other purposes.

Still further objects of my invention are to provide a hoist that is economical in manufacture, refined in appearance and durable in use.

These and other objects will be apparent to those skilled in the art.

My invention consists in the construction, arrangement, and combination of the various parts of the device, whereby the objects contemplated are attained as hereinafter more fully set forth, pointed out in my claims, and illustrated in the accompanying drawings, in which:

Fig. l is a rear view of my device with the jack in an extended position and having lifted one end of a farm wagon box a portion of which is also shown.

Fig. 2 is a side longitudinal sectional view of my device and a portion of a farm wagon box taken on line 2--2 of Fig. 1.

Fig. 3 is an enlarged view of the top portion of my hoist that more fully illustrates its structure.

Fig. 4 is a cross-sectional view of my device taken on the line 4-4 of Fig. 2.

In the drawings, I have used the numeral to designate a horizontal U-member. Extending downwardly and outwardly from each outer side of the U-member is a leg, designated by the numerals 11 and 12 respectively as shown in Fig. 1. Extending through, between, and to the rear of the upper ends of the legs is a horizontal bolt 13. The numeral 14 designates a bearing member rotatably mounted on the bolt 13 and positioned between the two free ends of the U-member 10. Extending upwardly from the bearing member are two spaced apart vertical cars 15 and 16. The numeral 17- horizontally curved toward the inside center area of the U-member. The numeral 19 designates a third leg ro-' tatably mounted on the bolt 13. The numeral 20 des-,

ignates a wagon box or like raisable member and which my device is adapted to lower or raise.

My frame construction is made to use an ordinary hydraulic jack having a base 21, a cylinder 22 and piston shaft 23. The numeral 24- designates a pulley wheel unit on the free end of the shaft 23. The numeral 25 designates a flexible cable extending over the pulley wheel, 0n the forward end of the cable is a book 26, detachably engaging the box 20. On the other and rear end of the cable is a length of link chain 27, any link of which is selectively engageable by the pin 17.

A manual pump and valve unit 28 communicates with the inside bottom of the jack cylinder. To use my device, the cylinder of the jack is inserted downwardly through the U-member until its base rests on a ledge 29 extending between the two legs 11 and 12. Cap screws or the like 30 may be used to secure the base of the jack from accidentally slipping off the ledge 29. The clamp shoe plate 18 will be loosely resting at the side of the jack cylinder and a substantial distance below its top end. To use my device, the pin 17 is removed, the hook 26 placed under the load to be handled, and the chain 27 manually pulled downwardly to remove slack'. The unit will extend upwardly and forwardly as shown in Fig. 2. Next (and with the jack piston in its lowest position), the pin 17 is inserted through the ears 15 and 16 and the closest adjacent link of the chain 27, as shown in Fig. 3. The jack is then actuated, and by its piston shaft moving upwardly, the wagon box will be elevated. However, the pull on the cars 15 and 16 will be forwardly, and inasmuch as the bearing member 14 is pivoted at its lower end, the clamp shoe means 18 will be accordingly pulled forwardly onto and into securing clamping engagement with the jack cylinder, thereby rigidly securing the upper portion of the jack to my frame structure. To prevent the accidental removal of the pin 17 from the cars, a cotter key may be extended through its free end as shown in Fig. 4. When not in use, it is a simple matter to remove the screws, bolts or the like 30, and lift the entire jack unit from the frame structure. jack detached, it may be used for other purposes.

Some changes may be made in the construction and arrangement of my hoist without departing from the real spirit and purpose of my invention, and it is my intention to cover by my claims, any modified forms of structure or use of mechanical equivalents which may be reasonably included within their scope.

I claim:

1. In a hoist, a horizontal U-member, two legs extending downwardly from said U-member, a bearing member pivoted between the free ends of said U-member, a ledge connecting said two legs, a hydraulic jack having a cylinder extending downwardly loosely within said U-member and with its bottom end operatively engaging said ledge and a piston shaft extending upwardly from said cylinder, a pulley wheel operatively secured to the upper end of said piston shaft, a cable extending over said pulley Wheel and adapted to have one end secured to the load to be handled, a link chain length on the other end of said cable, a clamping shoe plate secured to said bearing member adapted to engage the cylinder of said hydraulic jack, and a means on said bearing member for selectively engaging the links of said link chain; said last mentioned means being so positioned on said bearing member rela- With the hydraulic tive to its pivoted area that when said chain is under load stress said shoe plate will be moved into locking engagement with the cylinder of said hydraulic jack.

2. In a hoist, a horizontal U-member, two legs extending downwardly from said U-member, a bearing membfer pivoted between the free ends of said U-member, a ledge connecting said two legs, a hydraulic jack having a cylinder extending downwardly loosely within said U- m mber and with its bottom end operatively engaging said ledge and a piston shaft extending upwardly from said cylinder, a pulley wheel operatively secured to the upper end of said piston shaft, a cable extending over said pulley wheel and adapted to have one end secured to the load to be handled, a link chain length on the other end of said cable, a clamping shoe plate secured to said bearing member adapted to engage the cylinder of said hydraulic jack, and a detachable pin on Said bearing memb r capable of detachably selectively engaging any one of a plurality of links of said chain; said pin being so positioned on said bearing member relative to its pivoted area that when said chain is under load stress said shoe plate will be moved into locking engagement with the cylinder of said hydraulic jack.

3. In a hoist, a horizontal U-member, a support frame means secured to said U-member, a bearing member pivoted between the free ends of said U-mer'nber, a ledge on said support frame means, a hydraulic jack having a cylinder extending downwardly loosely within said U- member and with its bottom end operatively engaging said ledge and a piston shaft extending upwardly from said cylinder, a pulley wheel operatively secured to the upper end of said piston shaft, a cable extending over said pulley wheel and adapted to have one end secured to the load to be handled, a link chain length on the other end of said cable, a clamping shoe plate secured to said bearing member adapted to engage the cylinder of said hydraulic jack, and a means on said bearing member for selectively engaging the links of said link chain; said last mentioned means being so positioned on said bearing member relative to its pivoted area that when said chain is under load stress said shoe plate will be moved into locking engagement with the cylinder of said hydraulic jack.

4. In a hoist, a horizontal U-member, a support frame means secured to said U-member, a bearing member pivoted between the free ends of said U-member, a ledge on said support frame means, a hydraulic jack having a cylinder extending downwardly loosely within said U- member and with its bottom end operatively engaging said ledge and a piston shaft extending upwardly from said cylinder, a pulley wheel operatively secured to the upper end of said piston shaft, a cable extending over said pulley wheel and adaptedtto have one end secured to the load to be handled, a link chain length on the other end of said cable, a horizontally curved clamping shoe plate secured to said bearing member adapted to engage the cylinder of said hydraulic jack, and a means on said hearing member for selectively engaging the links of said link chain; said last mentioned means being so positioned on said bearing member relative to its pivoted area that when said chain is under load stress said shoe plate will be moved into locking engagement with the cylinder of said hydraulic jack.

References Cited in the file of this patent UNITED STATES PATENTS 

